| 摘要 |
PURPOSE:To reduce damage to a moving contact by providing a projection on the side surface of an intermediate bulkhead, and by abutting a part of a holder thereon, so as to regulate the opening distance of the moving contact. CONSTITUTION:A case 1 made of molded resin is partitioned by an intermediate bulkhead 1a into three-phased breaker chambers, and electrifying pass of each polarity is stored in each breaker chamber. A U-shaped groove 20 for burying an opening shaft 11 that connects a holder 10 to the intermediate bulkhead 1a, is provided in such a way that the upper surface is notched by the groove, and a groove 21 for storing an insulating barrier 26 is formed on the periphery of the U-shaped groove 20. A square stopper part 27 for regulating the opening position of a moving contact by abutting a part of the holder 10 on the outside surface of the intermediate bulkhead 1a, is formed in an integrated manner. A stage part 10a is formed on the side surface of the holder 10, and the stage part 10a is abutted on the stopper part 27 of the intermediate bulkhead 1a at the time of opening the moving contact. By regulating the opening position of the moving contact by abutting a part of the holder 10 on the projection 10a provided on the side surface of the intermediate bulkhead 1a, damage to the moving contact is prevented. |
